Run firewalld as a regular user, in a PID namespace.

Now that we have ambient capabilities, we don't need to run firewalld
as root.

BUG=chromium:715678
TEST=platform_Firewall
TEST=readlink /proc/`pgrep firewalld`/ns/pid
TEST=pid:[4026532158]
TEST=readlink /proc/1/ns/pid
TEST=pid:[4026531836]
CQ-DEPEND=CL:494127

Change-Id: I5e65c56886e8d57bb261edb171ff16dd931d7f1d
Reviewed-on: https://chromium-review.googlesource.com/488701
Commit-Ready: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
7 files changed